US20090007872A1 - Switchable dual lifter - Google Patents
Switchable dual lifter Download PDFInfo
- Publication number
- US20090007872A1 US20090007872A1 US12/165,900 US16590008A US2009007872A1 US 20090007872 A1 US20090007872 A1 US 20090007872A1 US 16590008 A US16590008 A US 16590008A US 2009007872 A1 US2009007872 A1 US 2009007872A1
- Authority
- US
- United States
- Prior art keywords
- lash adjuster
- housing
- hydraulic lash
- axial bore
- lifter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0005—Deactivating valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/245—Hydraulic tappets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
Definitions
- This invention relates to internal combustion engines and, more particularly, to dual lifters used in a valve train in an internal combustion engine.
- Dual lifters have two side-by-side hydraulic lash adjusters mounted in a common elongated housing and are used in internal combustion engines with four or more valves to simultaneously act on two side-by-side valves of the same cylinder.
- One end of the housing has a cam follower and the other end is open so that the hydraulic lash adjusters can contact push-rods or finger followers of the side-by-side valves.
- Such dual lifters act simultaneously on both valves so as to affect opening and closing of the valves.
- the object of this invention is a switchable dual lifter that allows for the deactivation of one of the valves of the side-by-side valves on a cylinder while maintaining the other valve of the side-by-side valves active.
- the invention achieves the above objects by using a switchable hydraulic lash adjuster in the dual lifter.
- An oil inlet port is provided in the common housing to activate and deactivate the switchable hydraulic lash adjuster between the locked mode and the unlocked mode. In the unlocked mode the hydraulic lash adjuster follows the cam motion without activating the valve.
- the present invention can be defined as a switchable dual lifter for two adjacent valves in a cylinder of an internal combustion engine comprising:
- a first hydraulic lash adjuster mounted in said first axial bore, one end of said first hydraulic lash adjuster adapted to contact a push-rod of one of two adjacent valves;
- a second hydraulic lash adjuster movably mounted in said second axial bore, one end of said second lash adjuster adapted to contact a push-rod of the other of the two adjacent valves;
- a locking member positioned at the other end of said second lash adjuster, movable with said second lash adjuster and engageable for selectably locking the housing and the second hydraulic lash adjuster together for coincidental, reciprocal movement;
- a lost motion spring positioned between said locking member and said one end of said second axial bore so as to allow said second hydraulic lash adjuster to move when said locking member is unlocked.
- a sleeve extends upward above said housing from said second axial bore.
- the sleeve has an internal opening with a diameter equal to the diameter of second axial bore and the internal opening and second axial bore are concentric.
- the sleeve acts as a guide for said second hydraulic lash adjuster as it extends above the housing.
- An oil inlet is provided in the housing to lock and unlock the locking member.
- the housing is cylindrical in shape.
- the first hydraulic lash adjuster can be replaced with a switchable hydraulic lash adjuster similar to the second hydraulic lash adjuster, the common housing can be provided with an oil inlet for the locking member of the second switchable lash adjuster, and a sleeve can be provided above the first bore to guide the reciprocal movement of the second switchable lash adjuster.
- FIG. 1 is a longitudinal cross section through a switchable dual lifter according to the present invention shown in the locked position;
- FIG. 2 illustrates the switchable valve of FIG. 1 in the unlocked position
- FIG. 3 shows a traverse cross-section through the locking member in the second bore
- FIGS. 4 and 5 illustrate the oil holes in the exterior of the housing of the dual lifter
- FIG. 6 illustrates the switchable dual lifter with two switchable hydraulic lash adjusters.
- FIG. 1 illustrates switchable dual lifter 1 having outer cylindrical housing 2 .
- Roller 3 acts as a cam contact member and is mounted at one end of housing 2 .
- Inside housing 2 is first axial bore 4 and second axial bore 5 .
- first hydraulic lash adjuster 6 is mounted in first axial bore 4 .
- second hydraulic lash adjuster 7 is mounted in second axial bore 5 .
- First hydraulic lash adjuster 6 and second hydraulic lash adjuster 7 each have distal ends 8 , 9 , base ends 10 , 11 , one-way valves 12 , 13 which divide high pressure chambers 14 , 15 from reservoirs 16 , 17 .
- Oil inlets 18 , 19 of the hydraulic lash adjusters 6 , 7 provide a means for oil to enter into reservoirs 16 , 17 .
- Oil inlets 20 , 21 are in housing 2 and allow oil from the engine block into the respective hydraulic lash adjusters 6 , 7 .
- channel 22 connects oil inlets 20 , 21 .
- Oil is provided to channel 22 by the engine block in order to provide oil to the hydraulic lash adjusters 6 , 7 .
- Locking member 23 is mounted in base 11 . As shown in FIG. 3 , locking member 23 comprises pistons 24 , 25 which are pushed in a radial direction into respective ports 26 , 27 by spring 28 . Port 27 connects to oil inlet 29 . Port 27 is in fluid communication with port 26 such that one hydraulic median is provided through inlet 29 to ports 26 , 27 , simultaneously. In this manner hydraulic median can be routed to the radial outer ends of pistons 24 , 25 to thereby cause compression spring 28 to be compressed and allow pistons 24 , 25 to retract into base 11 of second hydraulic lash adjuster 7 . When pistons 24 , 25 retract into base 11 , they leave ports 26 , 27 , thereby unlocking second hydraulic lash adjuster 7 from outer cylindrical housing 2 . Ports 26 , 27 are in the side wall of second axial bore 5 .
- Lost motion spring 30 is positioned between the bottom of second axial bore 5 and base end 11 of second hydraulic lash adjuster 7 .
- lost motion spring 30 allows second hydraulic lash adjuster 7 to move in a reciprocal motion with the cam and thereby deactivate the valve on which second lash adjuster 7 operates.
- Sleeve 31 extends outward above outer cylindrical housing 2 .
- Sleeve 31 has stops 32 which mate with stops 33 of second hydraulic lash adjuster 7 . The interaction between stops 32 and 33 prevent further upward movement of second lash adjuster 7 when second lash adjuster 7 is in the unlocked mode.
- second hydraulic lash adjuster 7 When second hydraulic lash adjuster 7 is in the locked mode, it acts on its respective push-rod and valve in order to open and close the valve. This means that the push-rod that is acted on by second hydraulic lash adjuster 7 is shorter than the push-rod that is acted on by first hydraulic lash adjuster 6 .
- both side by side valves will open simultaneously due to the action of dual lifter 1 .
- second hydraulic lash adjuster 7 When second hydraulic lash adjuster 7 is in the unlocked mode, the valve that is acted upon by first hydraulic lash adjuster 6 will open and close in response to the movement of the cam interacting with roller 3 , while lost motion spring 30 will allow second hydraulic lash adjuster 7 to move in a reciprocal manner so as to maintain the contact with its push-rod but to allow the valve to remain closed.
- two switchable dual lifters in accordance with the present invention can be employed such that one of the intake valves and one the exhaust valves of the cylinder can be maintained in a closed position while the other of the intake valves and the exhaust valves is opened and closed due to the cam action on the dual lifters. This closing of one of the intake valves and one of the exhaust valves allow for improvement in fuel consumption.
- Anti rotational pin 34 is used to prevent rotation of switchable dual lifter and is used to guide the lifter.
- switchable dual lifter 35 has both lash adjusters, switchable. Such an arrangement allows for control of which one of the two valves to shut down, left or right, and allows the whole cylinder to be shut down, i.e. none of the valves operate.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
- This invention relates to internal combustion engines and, more particularly, to dual lifters used in a valve train in an internal combustion engine.
- Dual lifters have two side-by-side hydraulic lash adjusters mounted in a common elongated housing and are used in internal combustion engines with four or more valves to simultaneously act on two side-by-side valves of the same cylinder. One end of the housing has a cam follower and the other end is open so that the hydraulic lash adjusters can contact push-rods or finger followers of the side-by-side valves. Such dual lifters act simultaneously on both valves so as to affect opening and closing of the valves.
- There is a need to de-activate one of the side-by-side valve when using a dual lifter in order to increase fuel efficiency of the engine.
- The object of this invention is a switchable dual lifter that allows for the deactivation of one of the valves of the side-by-side valves on a cylinder while maintaining the other valve of the side-by-side valves active.
- This and other objectives and advantages of the invention will become obvious from the following description.
- The invention achieves the above objects by using a switchable hydraulic lash adjuster in the dual lifter. An oil inlet port is provided in the common housing to activate and deactivate the switchable hydraulic lash adjuster between the locked mode and the unlocked mode. In the unlocked mode the hydraulic lash adjuster follows the cam motion without activating the valve.
- Broadly, the present invention can be defined as a switchable dual lifter for two adjacent valves in a cylinder of an internal combustion engine comprising:
- a common elongated housing;
- a cam contact member mounted at one end of said housing;
- a first axial bore in said housing, one end of said first axial bore adjacent said cam contact member and the other end of said first axial bore open;
- a second axial bore in said housing, one end of said second axial bore adjacent said cam contact member and the other end of said second axial bore open;
- a first hydraulic lash adjuster mounted in said first axial bore, one end of said first hydraulic lash adjuster adapted to contact a push-rod of one of two adjacent valves;
- a second hydraulic lash adjuster movably mounted in said second axial bore, one end of said second lash adjuster adapted to contact a push-rod of the other of the two adjacent valves;
- a locking member positioned at the other end of said second lash adjuster, movable with said second lash adjuster and engageable for selectably locking the housing and the second hydraulic lash adjuster together for coincidental, reciprocal movement; and
- a lost motion spring positioned between said locking member and said one end of said second axial bore so as to allow said second hydraulic lash adjuster to move when said locking member is unlocked.
- Preferably, a sleeve extends upward above said housing from said second axial bore. The sleeve has an internal opening with a diameter equal to the diameter of second axial bore and the internal opening and second axial bore are concentric. The sleeve acts as a guide for said second hydraulic lash adjuster as it extends above the housing.
- An oil inlet is provided in the housing to lock and unlock the locking member.
- Preferably, the housing is cylindrical in shape.
- The first hydraulic lash adjuster can be replaced with a switchable hydraulic lash adjuster similar to the second hydraulic lash adjuster, the common housing can be provided with an oil inlet for the locking member of the second switchable lash adjuster, and a sleeve can be provided above the first bore to guide the reciprocal movement of the second switchable lash adjuster.
- The invention will now be described more closely with reference to the attached drawings.
-
FIG. 1 is a longitudinal cross section through a switchable dual lifter according to the present invention shown in the locked position; -
FIG. 2 illustrates the switchable valve ofFIG. 1 in the unlocked position; -
FIG. 3 shows a traverse cross-section through the locking member in the second bore; -
FIGS. 4 and 5 illustrate the oil holes in the exterior of the housing of the dual lifter; and -
FIG. 6 illustrates the switchable dual lifter with two switchable hydraulic lash adjusters. -
FIG. 1 illustrates switchabledual lifter 1 having outercylindrical housing 2.Roller 3 acts as a cam contact member and is mounted at one end ofhousing 2. Insidehousing 2 is firstaxial bore 4 and secondaxial bore 5. Mounted in firstaxial bore 4 is firsthydraulic lash adjuster 6. Mounted in secondaxial bore 5 is secondhydraulic lash adjuster 7. - First
hydraulic lash adjuster 6 and secondhydraulic lash adjuster 7 each havedistal ends 8, 9,base ends way valves high pressure chambers reservoirs Oil inlets hydraulic lash adjusters reservoirs Oil inlets housing 2 and allow oil from the engine block into the respectivehydraulic lash adjusters FIG. 4 ,channel 22 connectsoil inlets - Oil is provided to
channel 22 by the engine block in order to provide oil to thehydraulic lash adjusters -
Locking member 23 is mounted inbase 11. As shown inFIG. 3 ,locking member 23 comprisespistons respective ports spring 28. Port 27 connects tooil inlet 29.Port 27 is in fluid communication withport 26 such that one hydraulic median is provided throughinlet 29 toports pistons compression spring 28 to be compressed and allowpistons base 11 of secondhydraulic lash adjuster 7. Whenpistons base 11, they leaveports cylindrical housing 2.Ports axial bore 5. - Lost
motion spring 30 is positioned between the bottom of secondaxial bore 5 andbase end 11 of secondhydraulic lash adjuster 7. Whenpistons base 11, lostmotion spring 30 allows secondhydraulic lash adjuster 7 to move in a reciprocal motion with the cam and thereby deactivate the valve on whichsecond lash adjuster 7 operates. - Sleeve 31 extends outward above outer
cylindrical housing 2. Sleeve 31 hasstops 32 which mate withstops 33 of secondhydraulic lash adjuster 7. The interaction betweenstops second lash adjuster 7 whensecond lash adjuster 7 is in the unlocked mode. - Other conventional locking members can be employed in order to lock second hydraulic lash adjuster 7 into outer
cylindrical housing 2. - When second
hydraulic lash adjuster 7 is in the locked mode, it acts on its respective push-rod and valve in order to open and close the valve. This means that the push-rod that is acted on by secondhydraulic lash adjuster 7 is shorter than the push-rod that is acted on by firsthydraulic lash adjuster 6. - When second
hydraulic lash adjuster 7 is in a locked mode, both side by side valves will open simultaneously due to the action ofdual lifter 1. - When second
hydraulic lash adjuster 7 is in the unlocked mode, the valve that is acted upon by firsthydraulic lash adjuster 6 will open and close in response to the movement of the cam interacting withroller 3, while lostmotion spring 30 will allow secondhydraulic lash adjuster 7 to move in a reciprocal manner so as to maintain the contact with its push-rod but to allow the valve to remain closed. - When operating an engine having four valves per cylinder, two intake valves and two exhaust valves, two switchable dual lifters in accordance with the present invention can be employed such that one of the intake valves and one the exhaust valves of the cylinder can be maintained in a closed position while the other of the intake valves and the exhaust valves is opened and closed due to the cam action on the dual lifters. This closing of one of the intake valves and one of the exhaust valves allow for improvement in fuel consumption.
- Anti
rotational pin 34 is used to prevent rotation of switchable dual lifter and is used to guide the lifter. - It will be appreciated that a dual valve has been shown with two lash adjusters, however, three hydraulic lash adjusters could be employed in the common outer cylindrical housing.
- In
FIG. 6 , switchabledual lifter 35 has both lash adjusters, switchable. Such an arrangement allows for control of which one of the two valves to shut down, left or right, and allows the whole cylinder to be shut down, i.e. none of the valves operate. -
- 1 Switchable dual lifter
- 2 Outer cylindrical housing
- 3 Roller
- 4 First axial bore
- 5 Second axial bore
- 6 First hydraulic lash adjuster
- 7 Second hydraulic lash adjuster
- 7′ Second hydraulic lash adjuster
- 8 Distal end of 6
- 9 Distal end of 7
- 10 Base end of 6
- 11 Base end of 7
- 12 One-
way valve 6 - 13 One-
way valve 7 - 14
High pressure chamber 6 - 15
High pressure chamber 7 - 16 Reservoir of 6
- 17 Reservoir of 7
- 18 Oil inlet of 6
- 19 Oil inlet of 7
- 20 Oil inlet for 6 in 2
- 21 Oil inlet for 7 in 2
- 22 Channel
- 23 Locking member
- 23′ Locking member
- 24 Piston
- 25 Piston
- 26 Port
- 27 Port
- 28 Spring
- 29 Oil inlet
- 29′ Oil inlet
- 30 Lost motion spring
- 30′ Lost motion spring
- 31 Sleeve
- 32 Stop in sleeve
- 33 Stop in 7
- 34 Anti rotational pin
- 35 Switchable dual lifter
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/165,900 US7921822B2 (en) | 2007-07-02 | 2008-07-01 | Switchable dual lifter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US94752807P | 2007-07-02 | 2007-07-02 | |
US12/165,900 US7921822B2 (en) | 2007-07-02 | 2008-07-01 | Switchable dual lifter |
Publications (2)
Publication Number | Publication Date |
---|---|
US20090007872A1 true US20090007872A1 (en) | 2009-01-08 |
US7921822B2 US7921822B2 (en) | 2011-04-12 |
Family
ID=40092743
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/165,900 Expired - Fee Related US7921822B2 (en) | 2007-07-02 | 2008-07-01 | Switchable dual lifter |
Country Status (2)
Country | Link |
---|---|
US (1) | US7921822B2 (en) |
DE (1) | DE102008030014A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100275864A1 (en) * | 2009-04-30 | 2010-11-04 | Schaeffler Technologies Gmbh & Co. Kg | Valve drive system |
CN102943700A (en) * | 2012-10-13 | 2013-02-27 | 中国兵器工业集团第七0研究所 | Hydraulic tappet of engine |
GB2503705A (en) * | 2012-07-05 | 2014-01-08 | Eaton Srl | Hydraulic Lash Adjuster and Lost Motion System |
US20170274399A1 (en) * | 2012-08-24 | 2017-09-28 | Microlin, Llc | Spill-resistant fluid delivery device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6606972B2 (en) * | 2001-09-19 | 2003-08-19 | Ina Schaeffler Kg | Switching element for a valve train of an internal combustion engine |
US7284519B1 (en) * | 2006-03-17 | 2007-10-23 | Schaeffler Kg | Device for hydraulic lash adjustment |
US7637237B2 (en) * | 2006-12-04 | 2009-12-29 | Schaeffler Kg | Switchable double tappet |
-
2008
- 2008-06-24 DE DE102008030014A patent/DE102008030014A1/en not_active Withdrawn
- 2008-07-01 US US12/165,900 patent/US7921822B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6606972B2 (en) * | 2001-09-19 | 2003-08-19 | Ina Schaeffler Kg | Switching element for a valve train of an internal combustion engine |
US7284519B1 (en) * | 2006-03-17 | 2007-10-23 | Schaeffler Kg | Device for hydraulic lash adjustment |
US7637237B2 (en) * | 2006-12-04 | 2009-12-29 | Schaeffler Kg | Switchable double tappet |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100275864A1 (en) * | 2009-04-30 | 2010-11-04 | Schaeffler Technologies Gmbh & Co. Kg | Valve drive system |
US8434437B2 (en) * | 2009-04-30 | 2013-05-07 | Schaeffler Technologies AG & Co. KG | Valve drive system |
GB2503705A (en) * | 2012-07-05 | 2014-01-08 | Eaton Srl | Hydraulic Lash Adjuster and Lost Motion System |
US20170274399A1 (en) * | 2012-08-24 | 2017-09-28 | Microlin, Llc | Spill-resistant fluid delivery device |
CN102943700A (en) * | 2012-10-13 | 2013-02-27 | 中国兵器工业集团第七0研究所 | Hydraulic tappet of engine |
Also Published As
Publication number | Publication date |
---|---|
US7921822B2 (en) | 2011-04-12 |
DE102008030014A1 (en) | 2009-01-08 |
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